Many smart devices on a home network are sitting ducks for hackers. Pick a trustworthy vendor with a track record of building secure devices. When configuring the smart device, swap the default credentials from the manufacturer with a strong and unique pair of your own. If possible, use a passphrase instead of a password, and pepper it with symbols, but make sure you can still remember it. If your router supports guest networking and you dont use it, reserve it for IoT devices. For full protection of smart devices, turn to Bitdefender BOX, the hardware security solution.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/simple-steps-protect-iot-home-network/